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Who has a better sense of smell: men or women?

The study conducted in Brazil was performed by studying the brains of deceased men and women. Researchers concluded that since the women's brains had more cells in the olfactory bulb, and the brain doesn't produce many cells as a person ages, that the women were born with more cells. The study does not answer why women have a keener sense of smell or if there's a biological purpose for it.

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What is the relationship between density and viscosity?

A substance's density refers to the amount of matter that exists in its unit volume. Density can be of mass density, specific weight or relative density. Mass density, which is symbolized by the Greek letter, rho, is equivalent to a substance's mass divided by its volume. Its unit is kilograms per cubic meter or kg/m3. For example, water's density is taken to be 1000 kg/m3 at room temperature and normal atmospheric pressure. A fluid's viscosity refers to its resistance to continuous movement or sheer deformation. Kinematic viscosity is characterized by the ratio of dynamic ..

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Why don't vegetable oil and water mix?

Though oil and water naturally separate from each other, that doesn't mean it's impossible to get oil and water (or other liquids of similar density to water) to mix. Common household items like bottled salad dressing are a good illustration of this principle. While pouring common dressing ingredients like vinegar and oil into a bottle and shaking it vigorously will temporarily cause the two to mix, they will quickly separate. However, through a process called emulsification, ingredients of different density and molecular polarity, including oil and water, can be brought together.\nA..

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What are deciduous forest food chains and food webs?

The deciduous forest biome is diverse and supports a wide range of animal and plant growth. Food webs are interlocking food chains that exist within the same ecosystem. For instance, a wide variety of animals eat berries and plants in the forest, creating a food web with predators, such as bears or mountain lions, at the top of the food chain.\nAt the bottom of the food web are producers. Producers include flowers, trees and other plants that support primary consumers. Primary consumers are the group of animals and birds that eat producers as their main source of food. In a deciduous forest, p..

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How does a water turbine work?

A hydropower plant converts the energy of naturally moving water, such as a river, into usable electrical energy. In order to do this, the plant needs a machine that can transfer the motion of water into a mechanical form. The water turbine serves this purpose. A turbine is usually disc-shaped and has a number of large, curved blades for catching the water's motion. This type of model is referred to as a Francis Turbine, and it is one of the most common types of water turbines\nTo convert mechanical energy into electrical energy, many generators require a revolutionary force. This is why ..

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What organisms use anaerobic respiration?

Anaerobic respiration is the process of producing the high-energy molecule adenosine triphosphate, or ATP, in the absence of oxygen. In terms of tolerance to oxygen, microbes are classified into five: obligate anaerobes, obligate aerobes, microaerophiles, aerotolerant and facultative.Obligate anaerobes are unable to survive in the presence of oxygen due to the lack of catalase and superoxide dismutase, which are enzymes that catalyze the breakdown of harmful substances. These organisms utilize the anaerobic respiration pathways to create ATP for various cellular functions. Compared to aerobic ..

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What is the function of renal medulla?

Renal pyramids consist of blood vessels and tube-like structures that collect filtrate. These pyramids contain nephrons, the basic unit that filters blood in the kidneys, according to Healthline. Millions of nephrons extend from the cortex to inner regions of the kidney. These structures regulate water concentration, extract salts from blood and reabsorb needed nutrients back into the body. Waste material is then excreted through urine. This process helps regulate blood pressure and blood volume throughout the body.\nMedulla regions are darker than the outer cortex. Healthline states that most..

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What are the organs in the female anatomy?

The vagina is described as the canal that links the cervix, which is the lower part of the uterus, to the outside of the body. The vagina is also called the birth canal. The uterus is a hollow, pear-shaped organ. It is used as a home for developing fetuses. The uterus is divided into two parts. The lower part is the cervix, which opens into the vagina, and the upper part is the corpus, which has the ability to expand greatly in size to house a developing fetus. There is a channel on the bottom side of the cervix that opens, which is where sperm enters the uterus and where menstrual blood exits..

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Can two green eyed parents have a brown eyed child?

However, Discover magazine reports that darker colors are more dominant and are more likely to win through. As Wikipedia explains, this means that if both parents have brown eyes, there is an increased probability of having a brown-eyed child. Two green-eyed parents could have a brown-, green- or even blue-eyed child. Eye color can also be affected by changing levels of melanin with time, and a blue-eyed newborn could become a brown-eyed child, according to the University of Delaware.

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What are the characteristics of red sandy soil?

The higher proportion of sand makes sandy soil grittier than other types. When a handful of red sandy soil is squeezed into a lump, the lump easily falls apart. This is in direct contrast to clay-based soils, which hold their shape when compressed. The less-cohesive nature of sandy soil provides good drainage around the plant roots. On the down side, sandy soils require more frequent watering or the use of other methods to retain moisture.\nOne example is the pineapple fields of Hawaii that are filled with iron rich, red sandy soil. Before planting, each field is treated with a fumigant and nu..

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